Laundry soap base taking single acid as raw material and preparation method of laundry soap base

Abstract

The invention relates to a washing soap base with a single acid as a raw material, the washing soap base comprises a fatty acid composition, the fatty acid composition comprises the single acid, and a preparation method of the washing soap base with the single acid as the raw material comprises the following steps: dissolving an additive and a chelating agent in water; adding sodium hydroxide with the same amount of substance as the fatty acid composition, and heating to obtain a water-phase liquid; adding an antioxidant into the fatty acid composition, and heating to obtain a fatty acid mixed solution; and slowly adding the fatty acid mixed solution into the water-phase liquid under high-speed stirring, carrying out neutralization reaction, continuously stirring, and dehydrating to obtain the laundry soap base. By adding the single acid raw material, on one hand, the washing soap base has better solubility in water by utilizing isomeric acid contained in the single acid and side chains carried by the isomeric acid, so that the washing soap base has better water solubility, better hard water resistance and good foam performance; on the other hand, the utilization channel of the single acid is expanded, the single acid resource is fully utilized, and the additional value of the single acid is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry and relates to a laundry soap base, in particular to a laundry soap base using a monoacid as a raw material and a preparation method thereof. Background Art

[0002] Monoacid is a by-product in the production process of dimer acid. Monoacid is composed of saturated fatty acids, unreacted unsaturated fatty acids, isomerized fatty acids in the raw materials that do not participate in the reaction, and a small amount of low-carbon unsaponifiable matter that breaks during the reaction. According to statistics, 0.46 tons of monoacid will be produced for every ton of dimer acid produced. At present, monoacid is mainly used to produce alkyd resins, polyamide resins and a small amount of isostearic acid. Due to the limited application range of monoacid, its usage is limited, resulting in a large backlog and waste of monoacid resources.

[0003] Most of the existing commercially available laundry soap bases are made from palm oil, soybean oil or other vegetable oil acids as the main raw materials through saponification with sodium hydroxide. The disadvantage is that the laundry soap has poor solubility at low temperatures, easily forms soap scum in hard water, and easily causes secondary pollution during washing. Summary of the invention

[0004] The object of the present invention is to provide a laundry soap base using monoacid as raw material in view of the above problems.

[0005] Another object of the present invention is to provide a method for preparing a laundry soap base using a monoacid as a raw material in view of the above-mentioned problems.

[0006] The present invention creatively proposes a laundry soap base using a monoacid as a raw material. The raw material of the laundry soap base comprises a fatty acid composition, and the fatty acid composition contains a monoacid.

[0007] In the above-mentioned laundry soap base using monoacid as raw material, the fatty acid composition further comprises lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid and linoleic acid.

[0008] In the above-mentioned laundry soap base using monoacid as raw material, the fatty acid composition comprises, by weight, 18-20 parts of monoacid, 9-12 parts of lauric acid, 2-4 parts of myristic acid, 42-46 parts of palmitic acid, 5-7 parts of stearic acid, 13-16 parts of oleic acid and 2-3 parts of linoleic acid.

[0009] In the above laundry soap base using monoacid as raw material, the freezing point of the fatty acid composition is 46-47.5°C.

[0010] In the above-mentioned laundry soap base using monoacid as raw material, the raw material of the laundry soap base further includes sodium hydroxide in an amount equal to that of the fatty acid composition.

[0011] In the above-mentioned laundry soap base using monoacid as raw material, the raw materials of the laundry soap base also include sodium hydroxide, additives, chelating agents and antioxidants.

[0012] In the above laundry soap base using monoacid as raw material, the additives include sodium chloride and glycerol.

[0013] As a preferred embodiment of the present invention, the additive consists of 0.5 parts of sodium chloride and 0.1 parts of glycerol by weight.

[0014] In the above laundry soap base using monoacid as raw material, the chelating agent includes one or more of tetrasodium ethylenediaminetetraacetic acid, hydroxyethylidene diphosphonic acid, tetrasodium glutamate diacetate and trisodium methylglycine diacetate.

[0015] As a preferred embodiment of the present invention, the chelating agent is composed of tetrasodium salt of ethylenediaminetetraacetic acid and hydroxyethylidene diphosphonic acid.

[0016] As another preferred embodiment of the present invention, the chelating agent consists of tetrasodium glutamate diacetate and trisodium methylglycine diacetate.

[0017] As a further preferred embodiment of the present invention, the chelating agent is composed of 0.1-0.2 parts of ethylenediaminetetraacetic acid tetrasodium salt and 0.1-0.2 parts of hydroxyethylidene diphosphonic acid by weight.

[0018] As a further preferred embodiment of the present invention, the chelating agent is composed of 0.1-0.2 parts of tetrasodium glutamate diacetate and 0.1-0.2 parts of trisodium methylglycine diacetate by weight.

[0019] The metal ions in the water can be chelated by the chelating agent combination.

[0020] In the above laundry soap base using monoacid as raw material, the antioxidant includes antioxidant BHT, namely 2,6-di-tert-butyl-4-methylphenol or other antioxidants.

[0021] As a further preferred embodiment of the present invention, the antioxidant is 0.01-0.02 parts of antioxidant BHT by weight.

[0022] Antioxidants can be used to keep the color of laundry soap base stable.

[0023] In the above laundry soap base using monoacid as raw material, the monoacid is a hydrogenated monoacid with an iodine value of less than 0.5, and the branched fatty acid contained in the hydrogenated monoacid accounts for more than 60wt%.

[0024] Specifically, as a preferred technical solution, the mass composition of hydrogenated monoacid is as follows:

[0025]

[0026] Hydrogenated monoacids have higher oil stability and reduce the color of monoacids, making them better for use in soap bases.

[0027] In the above-mentioned laundry soap base using monoacid as raw material, the preparation method of the hydrogenated monoacid is: distilling the crude monoacid at a distillation temperature of 200-210°C and a pressure of 30-40mbar, removing light components of fatty acids below C8 to obtain refined monoacid, adding 0.05%-0.2% catalyst to the refined monoacid, introducing hydrogen to make the pressure 8-20bar, the temperature between 150-250°C, circulating for 1-2 hours, releasing the pressure and discharging to obtain hydrogenated monoacid with an iodine value of less than 0.5.

[0028] The catalyst is one or more of a Raney nickel catalyst, a nickel-aluminum composite catalyst and a nickel-palladium composite catalyst.

[0029] The light components of fatty acids below C8 are mainly C6, C8 and other fatty acid components below C8. The purpose of removing the light components of fatty acids below C8 in crude monoacids is to reduce the influence of the light components on the odor of laundry soap.

[0030] In the above-mentioned laundry soap base using monoacid as raw material, the monoacid is a by-product of producing dimer acid. Oleic acid is polymerized into dimer acid at 220-280°C under the action of catalysts such as clay and lithium carbonate, and a small amount of unpolymerized and isomerized acid is obtained. The unpolymerized and isomerized acid are separated from the dimer acid by distillation to form crude monoacid.

[0031] Oleic acid is protonated at high temperature under the action of an acid catalyst, so that the two carbon atoms in between are positively charged, and the two positively charged carbon atoms are connected by a carbon-carbon bond. At the same time, the original carbon chain is broken to form a methyl group, and the proton is separated from the main carbon chain to re-form a double bond, thus forming a fatty acid with a branched chain. The reaction mechanism is as follows:

[0032]

[0033] Isomerized fatty acids have similar freezing points to oleic acid, and isomerized fatty acids have side chains that make them more soluble in water. At the same time, they do not contain double bonds after hydrogenation and are relatively stable.

[0034] A method for preparing a laundry soap base using a monoacid as a raw material comprises the following steps:

[0035] Dissolving the additive and the chelating agent in water, adding sodium hydroxide in an amount equal to that of the fatty acid composition and heating to obtain an aqueous liquid;

[0036] adding an antioxidant to the fatty acid composition and heating the mixture to obtain a fatty acid mixture;

[0037] The fatty acid mixture is slowly added into the aqueous phase liquid during high-speed stirring to carry out a neutralization reaction, and the mixture is continuously stirred and dehydrated to obtain a laundry soap base with a water content of 8-11%.

[0038] In the above method for preparing a laundry soap base using a monoacid as a raw material, an additive and a chelating agent are dissolved in water, sodium hydroxide in an amount equal to that of the fatty acid composition is added and heated to 90-95° C. to obtain an aqueous liquid phase;

[0039] adding an antioxidant to the fatty acid composition and heating the mixture to 80-85° C. to obtain a fatty acid mixture;

[0040] The fatty acid mixture is slowly added to the aqueous phase liquid during high-speed stirring to carry out a neutralization reaction, and the stirring is continued for 10-15 minutes, and the water is dehydrated to obtain a laundry soap base with a water content of 8-11%.

[0041] Compared with the prior art, the advantages of the present invention are:

[0042] 1) The present invention adds monoacid raw materials. On the one hand, the isomeric acid contained in the monoacid is utilized to make it have better solubility in water through its side chain, so that the laundry soap base has better water solubility, better resistance to hard water and good foaming performance, and has low-temperature cleaning power and is gentle and does not hurt the hands; on the other hand, the utilization channels of the monoacid are expanded, the monoacid resources are fully utilized, and the added value of the monoacid is increased.

[0043] 2) The present invention further adopts hydrogenated monoacids, which can improve the stability of oils and reduce the color of monoacids. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1a This is a diagram of the initial state of the laundry soap base obtained in Example 5;

[0045] Figure 1b This is a diagram of the initial state of the laundry soap base obtained in Example 8;

[0046] Figure 2a This is a state diagram of the laundry soap base obtained in Example 5 stored at 45° C. for 6 months;

[0047] Figure 2b This is a diagram showing the state of the laundry soap base obtained in Example 8 after being stored at 45°C for 6 months. DETAILED DESCRIPTION

[0048] Further described by the following specific examples;

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0050] Example 1

[0051] A laundry soap base using monoacid as raw material, wherein the raw material is composed of the following components:

[0052] 200g fatty acid composition, consisting of 19.7wt% monoacid, 10.2wt% lauric acid, 3.2wt% myristic acid, 44.6wt% palmitic acid, 5.1wt% stearic acid, 14.8wt% oleic acid, and 2.4wt% linoleic acid;

[0053] 64 g of a 48 wt % sodium hydroxide solution;

[0054] 0.4 g of chelating agent, consisting of 0.2 g of tetrasodium glutamate diacetate and 0.2 g of trisodium methylglycine diacetate;

[0055] 0.04g antioxidant BHT;

[0056] 1.25g additive, consisting of 1g sodium chloride and 0.25g glycerol.

[0057] Wherein, the monoacid is a hydrogenated monoacid, and its preparation method is as follows:

[0058] The crude monoacid was distilled at a distillation temperature of 200°C and a pressure of 30 mbar to remove light components of fatty acids below C8 to obtain refined monoacid. 0.05% nickel-palladium composite catalyst was added to the refined monoacid, and hydrogen was introduced at a pressure of 10 bar and a temperature of 200°C for 1.5 hours. The pressure was released and the material was discharged to obtain hydrogenated monoacid with an iodine value of less than 0.5.

[0059] Example 2

[0060] A laundry soap base using monoacid as raw material, wherein the raw material is composed of the following components:

[0061] 200g fatty acid composition, consisting of 19.7wt% monoacid, 10.2wt% lauric acid, 3.2wt% myristic acid, 44.6wt% palmitic acid, 5.1wt% stearic acid, 14.8wt% oleic acid, and 2.4wt% linoleic acid;

[0062] 64 g of a 48 wt % sodium hydroxide solution;

[0063] 0.4 g of chelating agent, consisting of 0.2 g of ethylenediaminetetraacetic acid tetrasodium salt and 0.2 g of hydroxyethylidene diphosphonic acid;

[0064] 0.04g antioxidant BHT;

[0065] 1.25g additive, consisting of 1g sodium chloride and 0.25g glycerol.

[0066] Wherein, the monoacid is a hydrogenated monoacid, and its preparation method is the same as that in Example 1.

[0067] Example 3

[0068] A laundry soap base using monoacid as raw material, wherein the raw material is composed of the following components:

[0069] 200 g fatty acid composition, consisting of 19.2 wt% mono-acid, 10.5 wt% lauric acid, 3.5 wt% myristic acid, 43.3% palmitic acid, 6.2% stearic acid, 15.1% oleic acid, and 2.2 wt% linoleic acid;

[0070] 64 g of a 48 wt % sodium hydroxide solution;

[0071] 0.8 g of a chelating agent, consisting of 0.4 g of ethylenediaminetetraacetic acid tetrasodium salt and 0.4 g of hydroxyethylidene diphosphonic acid;

[0072] 0.02g antioxidant BHT;

[0073] 1.25g additive, consisting of 1g sodium chloride and 0.25g glycerol.

[0074] Wherein, the monoacid is a hydrogenated monoacid, and its preparation method is as follows:

[0075] The crude monoacid is distilled at a temperature of 210°C and a pressure of 40 mbar to remove light components of fatty acids below C8 to obtain refined monoacid. 0.1% nickel-palladium composite catalyst is added to the refined monoacid, and hydrogen is introduced at a pressure of 8 bar and a temperature of 150°C. The cycle is repeated for 1 hour, and the pressure is released to obtain hydrogenated monoacid with an iodine value of less than 0.5.

[0076] Example 4

[0077] A laundry soap base using a monoacid as a raw material, the components of the raw materials are the same as those in Example 1, except that the monoacid is a refined monoacid that has not been hydrogenated, and the preparation method thereof is as follows:

[0078] The crude monoacid is distilled at a temperature of 200°C and a pressure of 30 mbar to remove light components of fatty acids below C8 to obtain refined monoacid.

[0079] Example 5

[0080] A laundry soap base using monoacid as raw material is prepared by the following method:

[0081] S1: Prepare raw materials according to the composition of Example 1.

[0082] S2: dissolving the additive and the chelating agent in 700 g of water according to the set amount, adding a sodium hydroxide solution with a content of 48 wt%, and heating to 90° C. to obtain an aqueous phase liquid;

[0083] An antioxidant is added to the fatty acid composition according to a set amount and heated to 80° C. to obtain a fatty acid mixed solution.

[0084] S3 starts high-speed shear stirring, slowly adds the fatty acid mixture into the aqueous phase liquid during high-speed stirring, fully stirs, and performs a neutralization reaction. After the reaction is completed, maintain the temperature at 90°C for 10 minutes, cool and dehydrate, until a laundry soap base with a water content of 11% is obtained.

[0085] Example 6

[0086] A laundry soap base using monoacid as raw material is prepared by the following method:

[0087] S1: Prepare raw materials according to the composition of Example 2.

[0088] S2: dissolving the additive and the chelating agent in 700 g of water according to the set amount, adding a sodium hydroxide solution with a content of 48 wt%, and heating to 90° C. to obtain an aqueous phase liquid;

[0089] An antioxidant is added to the fatty acid composition according to a set amount and heated to 80° C. to obtain a fatty acid mixed solution.

[0090] S3 starts high-speed shear stirring, slowly adds the fatty acid mixture into the aqueous phase liquid during high-speed stirring, fully stirs, and performs a neutralization reaction. After the reaction is completed, maintain the temperature at 90°C for 10 minutes, cool and dehydrate, until a laundry soap base with a water content of 8% is obtained.

[0091] Example 7

[0092] A laundry soap base using monoacid as raw material is prepared by the following method:

[0093] S1 Prepare raw materials according to the composition of Example 3.

[0094] S2: dissolving the additive and the chelating agent in 700 g of water according to the set amount, adding a sodium hydroxide solution with a content of 48 wt%, and heating to 90° C. to obtain an aqueous phase liquid;

[0095] Adding an antioxidant in a set amount to the fatty acid composition and heating to 80° C. to obtain a fatty acid mixture;

[0096] Turn on high-speed shear stirring, slowly add the fatty acid mixture into the aqueous phase liquid during high-speed stirring, fully stir, and carry out neutralization reaction. After the reaction is completed, maintain the reaction at 90°C for 15 minutes, cool and dehydrate, until a laundry soap base with a water content of 10% is obtained.

[0097] Example 8

[0098] A laundry soap base using monoacid as raw material is prepared by the following method:

[0099] S1 Prepare raw materials according to the composition of Example 4.

[0100] S2: dissolving the additive and the chelating agent in 700 g of water according to the set amount, adding a sodium hydroxide solution with a content of 48 wt%, and heating to 90° C. to obtain an aqueous phase liquid;

[0101] An antioxidant is added to the fatty acid composition according to a set amount and heated to 80° C. to obtain a fatty acid mixed solution.

[0102] S3 starts high-speed shear stirring, slowly adds the fatty acid mixture into the aqueous phase liquid during high-speed stirring, fully stirs, and performs a neutralization reaction. After the reaction is completed, maintain the temperature at 90°C for 10 minutes, cool and dehydrate, until a laundry soap base with a water content of 11% is obtained.

[0103] Comparative Example

[0104] A laundry soap base using monoacid as raw material is prepared by the following method:

[0105] S1 is formulated with the following ingredients:

[0106] 200g fatty acid composition, consisting of 10.5wt% lauric acid, 2.8wt% myristic acid, 41.6wt% palmitic acid, 10.4wt% stearic acid, 27.3wt% oleic acid, and 7.4wt% linoleic acid;

[0107] 64 g of a 48 wt % sodium hydroxide solution;

[0108] 0.4 g of chelating agent, consisting of 0.2 g of tetrasodium glutamate diacetate and 0.2 g of trisodium methylglycine diacetate;

[0109] 0.04g antioxidant BHT;

[0110] 1.25g additive, consisting of 1g sodium chloride and 0.25g glycerol.

[0111] S2: dissolving the additive and the chelating agent in 700 g of water according to the set amount, adding a sodium hydroxide solution with a content of 48 wt%, and heating to 90° C. to obtain an aqueous phase liquid;

[0112] An antioxidant is added to the fatty acid composition according to a set amount and heated to 80° C. to obtain a fatty acid mixed solution.

[0113] S3 starts high-speed shear stirring, slowly adds the fatty acid mixture into the aqueous phase liquid during high-speed stirring, fully stirs, and performs a neutralization reaction. After the reaction is completed, maintain the temperature at 90°C for 10 minutes, cool and dehydrate, until a laundry soap base with a water content of 11% is obtained.

[0114] Application Examples

[0115] The soap bases obtained in Examples 5-8 and the comparative example were prepared into a solution with a concentration of 0.25%, and the detergency of different soap bases at different hardnesses was compared with the detergency of standard powder according to the determination method of GB / T 13174-2021 for detergency and cyclic washing performance of detergents for clothing. The results are as follows:

[0116]

[0117] The results show that the soap base with added monoacid has significantly higher anti-hard water effect than the soap base without added monoacid.

[0118] The soap bases obtained in Example 5 and Example 8 were compared in color. Figure 1a and Figure 1b As shown, the color comparison was performed again after storage at 45°C for 6 months. Figure 2a and Figure 2b As shown, the results show that the soap base of hydrogenated monoacids is lighter in color and has higher stability than that of unhydrogenated monoacids.

[0119] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0120] Although the terms such as medium laundry soap base, fatty acid composition, monoacid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, sodium hydroxide, additives, chelating agents, antioxidants, crude monoacid, hydrogenated monoacid are used more frequently in this article, these terms are used only to more conveniently describe and explain the essence of the present invention, and it is contrary to the spirit of the present invention to interpret them as any additional limitation.

Claims

1. A laundry soap base using monoacid as raw material, characterized in that: The raw materials of the laundry soap base include a fatty acid composition, which contains monoacids.

2. A laundry soap base made from a monoacid as a raw material as claimed in claim 1, characterized in that: The fatty acid composition also includes lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and linoleic acid.

3. A laundry soap base made from a monoacid as a raw material as claimed in claim 1, characterized in that: In parts by weight, the fatty acid composition comprises 18-20 parts of monoacid, 9-12 parts of lauric acid, 2-4 parts of myristic acid, 42-46 parts of palmitic acid, 5-7 parts of stearic acid, 13-16 parts of oleic acid and 2-3 parts of linoleic acid.

4. A laundry soap base made from a monoacid as a raw material according to any one of claims 1 to 3, characterized in that: The freezing point of the fatty acid composition is 46-47.5°C.

5. A laundry soap base made from a monoacid as a raw material according to any one of claims 1 to 3, characterized in that: The raw materials of the laundry soap base also include sodium hydroxide in an amount equal to that of the fatty acid composition.

6. A laundry soap base made from a monoacid as a raw material as claimed in claim 1, characterized in that: The raw materials of the laundry soap base also include sodium hydroxide, additives, chelating agents and antioxidants.

7. A laundry soap base made from a monoacid as a raw material as claimed in claim 6, characterized in that: The additives include sodium chloride and glycerol.

8. A laundry soap base made from a monoacid as a raw material as claimed in claim 1, characterized in that: The monoacid is a hydrogenated monoacid with an iodine value of less than 0.5, and the branched fatty acid in the hydrogenated monoacid accounts for more than 60 wt%.

9. A laundry soap base made from a monoacid as a raw material as claimed in claim 8, characterized in that: The preparation method of the hydrogenated monoacid is as follows: distilling the crude monoacid at a distillation temperature of 200-210° C. and a pressure of 30-40 mbar, removing light components of fatty acids below C8 to obtain refined monoacid, adding 0.05%-0.2% catalyst to the refined monoacid, introducing hydrogen to make the pressure between 8-20 bar and the temperature between 150-250° C., circulating for 1-2 hours, and releasing the pressure to obtain the hydrogenated monoacid with an iodine value of less than 0.

5.

10. The method for preparing a laundry soap base using a monoacid as a raw material according to any one of claims 1 to 9, characterized in that: The following steps are involved: Dissolving the additive and the chelating agent in water, adding sodium hydroxide in an amount equal to that of the fatty acid composition and heating to obtain an aqueous liquid; adding an antioxidant to the fatty acid composition and heating the mixture to obtain a fatty acid mixture; The fatty acid mixture is slowly added into the aqueous phase liquid during high-speed stirring to carry out a neutralization reaction, and the mixture is continuously stirred and dehydrated to obtain a laundry soap base with a water content of 8-11%.

Images